[Asterisk-Users] RE: Noise on ZAP channel

[brett at websmyths.com]

On 8/30/2005, "Geoff Manning" <gmanning at zoom.com> wrote:
>brett at websmyths.com wrote:
>> Also - an outside chance - make sure Tip and Ring
>> are correct. You could be getting ground loops - depends on the noise.
>>
>
> I am having noise and slip errors between my TE110P and a legacy PBX T1
> card. Could this be the same symptom? The connection is made using a 15
> pin serial on the T1 Card side to RJ48 on the TE110P side. I can't
> determine what the pinout is on the serial side.

Probably not Geoff. It is still digital at that point I think.
It should be coming to you as a four wire balanced circuit.
It depends on which legacy PBX you are using (tho it is pretty standard)
And if it wasn't right - it probably wouldn't work at all.

Brett